Headphones for up to 70 pounds

I would appreciate some advice concerning headphones for up to 70 pounds. I'll use them for gaming, so I need good positioning etc. I've been told to consider Steelseries 5h v2 and Sennheisers hd 555. Thank you in advance.

They are little over your £70 budget, but the Audio-Technica ATH-AD500 would be a good choice for gaming as the positional accuracy is nearly as impressive as their bigger brother (the ATH-AD700). They are very sensitive headphones, so work well with portable devices and soundcards.